“Losing weight is 80 percent mental and 20 percent physical,” says Dr. Ian K. Smith in his latest book, “The 4 Day Diet.” Smith, best known as the diet expert on VH1's “Celebrity Fit Club,” has designed a diet that is done in four-day modules. In this excerpt, he writes about how to face temptation — and win. Resist temptation: Your mind must lead you

It’s a bird. It’s a plane. Nope, it’s me–hanging completely upside down, being supported by a 10-inch-wide piece of cloth and wondering how on earth I decided this was a good idea. AntiGravity Yoga is the newest trend amongst the pricey “glam” gyms and has been catching on in a big way. Combining yoga, pilates and acrobatics, it promises to realign and release your joints from the pressures of gravity. I decide to try it out because it looks, for lack of a more adult phrase, super fun. Walking into class, I get the impression that this will be easy. Guess again.

As unlikely as it sounds, converts of 'AntiGravity Yoga' say the technique enables them to reach positions other exercises can't reach, leading to a better all-round work-out. Participants use a hammock suspended from the ceiling to carry out yoga, pilates and dance moves while defying gravity. It is becoming more and more popular in America and fitness experts believe it is only a matter of time before it 'takes off' here. Crunch, a US gym chain, has been pioneering AntiGravity Yoga with its one-hour sessions, which it has nick-named 'Wings'.

Close your eyes. Relax your mind. Relax your body. While it sounds like nap time at the gym, it's actually the cool-down portion of a new workout called AntiGravity Yoga. Flying, jumping, hanging upside down. And believe it or not ... "It's very relaxing."

Bikram's Yoga, also known as Hot Yoga, or "Fire Yoga" is a style of yoga developed by Bikram Choudhury and a Los Angeles, California based company. Bikram Yoga is ideally practiced in a room heated to 105°F (40.5°C) with a humidity of 40%. Classes are guided by specific dialogue including 26 postures and two breathing exercises. Classes last approximately 90 minutes. Beginners may take Bikram's yoga classes.

Aerial yoga is on its way to becoming a trend in the area similar to the fitness regime of AntiGravity Yoga, which is popular in cities such as Chicago, Los Angeles, Miami, New York and San Francisco. It's been featured on "The View" and labeled by www.msn.com as one of the top fitness trends. There are no licensed establishments for that trademarked exercise in Michigan, but there have been about 13 inquiries from around the state, a few near Detroit, said Christopher Harrison, creator and founder of AntiGravity Inc.